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Charging circuit
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Patent number 5,006,780
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Issue date Apr 9, 1991
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Hitachi, Ltd.
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Kozo Tamura
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Water purifier
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Patent number 4,732,674
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Issue date Mar 22, 1988
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Hitachi, Ltd.
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Kozo Tamura
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE